Low-power activation of accessory in sleep state

Abstract

A first device is configured to establish a connection over a short-range communication link with a second device. The first device may transition to a sleep state, terminate (i) a paging operation and a page scanning operation associated with a paging protocol and (ii) an advertisement scanning operation associated with an advertisement protocol and perform an advertisement broadcast operation associated with the advertisement protocol, the advertisement broadcast operation generating an advertisement to be broadcast at a first interval, wherein the first interval is greater than a second interval for performing advertisement broadcast operations in an active state.

What is claimed is: 
     
       1. A method, comprising:
 at a wireless device having a short-range communication link with a source device, wherein, the wireless device operates in a first power state when the short-range communication link is connected: 
 identifying a condition related to the wireless device; 
 placing the wireless device in a second power state that is a lower power state than the first power state, based on identifying the condition, and maintaining the short-range communication link connection in the second power state; 
 starting a timer based on identifying the condition; and 
 when the timer reaches a predetermined value, disconnecting the short-range communication link and placing the wireless device in a third power state that is a lower power state than the second power state. 
 
     
     
       2. The method of  claim 1 , wherein identifying the condition is based on input from a sensor of the wireless device. 
     
     
       3. The method of  claim 2 , wherein the sensor comprises one of a motion sensor, an optical sensor or an orientation sensor. 
     
     
       4. The method of  claim 1 , further comprising:
 when in the third power state, transmitting low-energy advertisements at a first rate that is a lower rate than advertisements transmitted in the first power state or second power state. 
 
     
     
       5. The method of  claim 4 , wherein the low-energy advertisements comprise a payload indicating the wireless device is in the third power state. 
     
     
       6. The method of  claim 4 , further comprising:
 when in the third power state, suspending a scanning and paging activity of the wireless device. 
 
     
     
       7. The method of  claim 4 , wherein the low-energy advertisements comprise BLUETOOTH LOW ENERGY (BLE) advertisements. 
     
     
       8. A processor of a wireless device having a short-range communication link with a source device, wherein the wireless device operates in a first power state when the short-range communication link is connected, the processor configured to perform operations comprising:
 identifying a condition related to the wireless device; 
 placing the wireless device in a second power state that is a lower power state than the first power state, based on identifying the condition, and maintaining the short-range communication link connection in the second power state; 
 starting a timer based on identifying the condition; and 
 when the timer reaches a predetermined value, disconnecting the short-range communication link and placing the wireless device in a third power state that is a lower power state than the second power state. 
 
     
     
       9. The processor of  claim 8 , wherein identifying the condition is based on input from a sensor of the wireless device. 
     
     
       10. The processor of  claim 8 , the operations further comprising:
 when in the third power state, transmitting low-energy advertisements at a first rate that is a lower rate than advertisements transmitted in the first power state or second power state. 
 
     
     
       11. The processor of  claim 10 , wherein the low-energy advertisements comprise a payload indicating the wireless device is in the third power state. 
     
     
       12. The processor of  claim 10 , the operations further comprising:
 when in the third power state, suspending a scanning and paging activity of the wireless device. 
 
     
     
       13. The processor of  claim 10 , wherein the low-energy advertisements comprise BLUETOOTH LOW ENERGY (BLE) advertisements. 
     
     
       14. A wireless device, comprising:
 a radio configured to connect over a short-range communication link with a source device, wherein the wireless device operates in a first power state when the short-range communication link is connected; and 
 a processor communicatively coupled to the radio and configured to perform operations comprising: 
 identifying a condition related to the wireless device; 
 placing the wireless device in a second power state that is a lower power state than the first power state, based on identifying the condition, and maintaining the short-range communication link connection in the second power state; 
 starting a timer based on identifying the condition; and 
 when the timer reaches a predetermined value, disconnecting the short-range communication link and placing the wireless device in a third power state that is a lower power state than the second power state. 
 
     
     
       15. The wireless device of  claim 14 , the operations further comprising:
 a sensor providing input to the processor, wherein identifying the condition is based on the input from the sensor. 
 
     
     
       16. The wireless device of  claim 15 , wherein the sensor comprises one of a motion sensor, an optical sensor or an orientation sensor. 
     
     
       17. The wireless device of  claim 14 , the operations further comprising:
 when in the third power state, transmitting low-energy advertisements at a first rate that is a lower rate than advertisements transmitted in the first power state or second power state. 
 
     
     
       18. The wireless device of  claim 17 , wherein the low-energy advertisements comprise a payload indicating the wireless device is in the third power state. 
     
     
       19. The wireless device of  claim 17 , the operations further comprising:
 when in the third power state, suspending a scanning and paging activity of the wireless device. 
 
     
     
       20. The wireless device of  claim 17 , wherein the low-energy advertisements comprise BLUETOOTH LOW ENERGY (BLE) advertisements.